Calendar calculating device



nvenonn Nov. 24, 1936. N. F. MEARS CALENDAR CALCULATING DEVICE FiledApril 19, 1935 ig. l

24. wu 1b 07 15 0 Witnesg Patented Nov. 24, 1936 UNITED smrss rATEN'roFFlcE CALENDAR CALCULATING DEVICE Neal F. Mears, Chicago, Ill.

Application April 19,

12 Claims.

My invention relates to an improved calendar calculator which isparticularly useful in the chronological eld for determining the datesof the month and the days of the week of certain past or future events.

Among the important objects of my invention are: to provide a simple,inexpensive device for calculating dates; to provide a device to findany desired year without recourse to tables, calculations orinter-referenced data; to provide a device which will give all themonths of any desired year at one setting; to provide a device whichshows the periodic agreement existing between the calendars of diierentyears; to provide a device which will enable the ordinary person todetermine desired days and dates as easily in the discarded old stylecalendar as in the current new style calendar; to provide a device whichpermits the use of data beyond the scope of ordinary problems and whichhence supplies information beyond the limits of ordinary need; and ingeneral to provide an improved and simplied structure which willillustrate these and many other calculations and reorganizations ofchronology.

My improved device is disclosed on the accompanying drawing in whichFig. 1 is a plan view of the device with a part of the upper memberbroken away on the one side, and a part of both the upper andintermediate members broken away on the other side.

Fig. 2 is a horizontal diametral sectional view.

The structure shown comprises three members, a large or bottom disc, anupper or smaller disc, and an intermediate disc. These members areconnected to be adapted for relative parallel movement either instraight lines or along curved lines. In the device shown the membersare circular and are pivoted together at their centers to adapt them forrelative rotational movement.

The large or base disc I!) has outer and inner rows II and I2,respectively, printed thereon, these rows being circular and concentric.1n the outer row I I are the numerals from one to ninety-nine, two setsof double ciphers, and one iigure two thousand, arranged in a certainpredetermined calculated succession and subdivided into sections. In theinner row i2 are day figures arranged in fourteen conventional months(each consisting of thirty-one days), placed so that the two which beginon the same day of the week are adjacent. Both these rows, Il and I2,are arranged to read in clockwise order.

The intermediate disc I3 has a series of seven windows I4, I4, adaptedto register with the in- 1935, Serial No. 17,288

(Cl. I0-115) ner row I2 on the large disc and to disclose alternatemonth sections of said row I2. In segments alternating with thesewindows I4, I4, are century indicia i5, I5. Outside one of these centurysections and on the periphery of the in- 5 termediate disc is the yearindicator I6, which is adapted to register with a chosen section of theouter row II of the large disc.

The small disc Il has seven windows, I9, I9, adapted to register andcoincide with the windows, I4, I 4, on the intermediate disc I3.

Outside the windows I9, I9, are month names I8, I8, arranged in apredetermined calculated order. For convenience, all these month namesare followed by iigures indicating the number of days in each month.There are two rows of such month names, arranged concentrically, andthose month names includable in a leap year calculation are enclosed bya border.

The small disc Il also has another window 20, identified by the wordcentury 2|, and this window is positioned to register with the centuryindicia I5, I5, on the intermediate disc I3.

The three members, the large disc I0, the intermediate disc I3, and thesmall disc I1 are 25 pivoted concentrically as by means of the eyelet e.

The theoretical basis underlying the construction of the illustratedform of this calendar calculating device is that each month of the yearbegins on some day of the week, and that, in every year, each day of theweek will occur one or more times as the first day of a month. On thispremise there are only seven different months in a year, according tothe day of the week on which each begins. Since leap year somewhatchanges the succession of days, two groups of seven different months,each month therein beginning on a different day of the week, with dueallowance for leap year, will include all possible months. The sevenwindows I9, I9., of the large member Ill, which coincide with the sevenwindows I4, I4, of the intermediate member I3, thus show all the monthsof the year in the seven which they disclose. It is obvious that thisgrouping of day iigures I2, I2, and the operation thereon of theselective windows I4, I4, and I9, I9, produce, in effect, a series offourteen different years-seven years being regular years and eachbeginning on a different day of the weekand seven being leap years andeach beginning on a different day of the week. Thus there is a regularyear wherein Monday is the first day of the year, a leap year whereinMonday is the first day of the year, and so on, for each day of theweek. 55

The various possible forms of my device Will, therefore, select one ofthese fourteen years, however the day figures and month names may begrouped, according to the century and the year figures combined.

The operation of my improved calendar calculating device can nowbereadily understood. Suppose it is desired to find the calendar for theyear 1935. The procedure is illustrated in Fig. 1. rlhe small member I'Iis rotated until the indicia New style-1500, 1900, 2300, appear inwindow 20 which has associated with it the selective indicator Century2I. This action, by selecting the century 1900 has set the device forthe first two figures (i. e. 19-) of the year 1935, New style. The smallmember II and the intermediate member I3 are now held together androtated as one until the selective indicator Year I6 on the intermediatemember I3 registers with the group of figures, in row II on the largemember I0, which contains the numeral 35, This last action has set thedevice for the last two figures (i. e.35) of the year 1935. It will nowbe noticed that certain day figures I2, I2, appear through the windowsI4, I4, and I9, I9, and that the names of the months I8, I8, agree withthe figures in the months I2, I2, so that an accurate calendar for theyear 1935 is now shown.

The proper century figures and the proper year figures are indicated inthe drawing of this device so that there may be selected any year from 8B. C., the first consistent year of our present calendar system, to 2399A. D.-but this scope is determined by the century indicia I5, I 5, onmember I3, and extensions may obviously be made by properly amending thecentury indicia.

A great many other chronological problems can be worked out on myimproved device. Its operation is very simple. There YareY only threeadjustable members and after they are associated by the process of twosettings the desired information is clearly visible' and definite.

I do not, of course, desire to be limited to the exact construction,arrangement and operation shown and described, as changes andmodifications might readily be made which Vwould still come within thescope of my invention.

I claim as new and desire to secure by Letters Patent:

1. A calendar calculating device comprising the combination of a largemember bearing year figures and day figures; an intermediate memberbearing century figures and having a year figure selector which operateson the year figures on the large member, and having seven windows whichregister with the day figures on the large member; and a small memberbearing month names and having seven windows which register with thewindows of the intermediate member, and having a century selector windowwhich registers with the century figures on the intermediate member; thethree members being pivoted together for concentric rotation.

2. A calendar calculating device comprising the combination of onemember bearing year figures and day figures; another member bearingcentury figures and having means for selecting the year figures on thefirst mentioned member; another member bearing month names and havingmeans for selecting the century gures on the second mentioned member,and means for selecting the dayrfigures on the first mentioned member;all members being adapted for relative movement.

3. A calendar calculating device comprising a plurality of members, oneof said members bearing day figures and year figures; another of saidmembers bearing century figures and having a selector adapted to operateon the year figures on the first mentioned member; another memberbearing month names and having a selector adapted to operate on thecentury figures on the second mentioned member and also having sevenselectors which operate on the day figures on the first mentioned memberand resolve the twelve months of any year into seven months.

`1. A calendar calculating device comprising one member sliding overanother and selecting the months of a year; another member sliding overamember and selecting the hundreds figures of a year; another membersliding over a member and selecting the tens figures of a year; thewhole being adapted for relative movement and setting to give the yearand the proper months associated with it.

5. A calendar calculating device comprising a plurality of members, onemember having thereon year gures and day figures; another member havingthereon century figures; another member having thereon month names; thesecond and third mentioned members having associated therewith selectingmeans; and all members being relatively movable so that the center linesof the pathways of the indicia on all members remain equidistant whilesaid members are in motion being set.

6. A calendar calculating device comprising a plurality of members, onemember having thereon day figures; another member having thereon monthnames; another member having thereon century figures; the indicia oneach of said members interacting with century figures and year figuresso that setting of said members can be made to give a desired year4 andthe proper months associated therewith.

7. A calendar calculating device comprising a plurality of members, onemember having thereon day figures; another member having thereon monthnames; another member having thereon i century figures; the indicia oneach of said members interacting with century figures and year figuresso that a setting of said members can be made to give a desired year andto show all of the months of said year at once.

8. A calendar calculating device comprising a plurality of members, onemember having day figures and year figures; another member havingcentury figures and a selector which operates on one portion of theindicia on the first mentioned member; another member having month namesand a selector which operates on the indicia, on the second mentionedmember; a setting allowing an association of another portion of theindicia on the first mentioned member and the indicia on the thirdmentioned member.

9. A calendar calculating device having a plurality of members bearingday figures, year figures and century figures, and month names; andassociated therewith selectors for months, year and century; the wholeso adapted for movement that when the total figures comprising a desiredyear are set adjacent, the proper calendar months for that year Will beselected.

10. A calendar calculating device having a plurality of members bearingday figures, year figures and century figures, and month names, andassociated therewith selectors for months, year and century, the wholeso adapted for movement that when the total figures comprising a desiredyear are set adjacent all except the proper calendar months for thatyear will be excluded from View.

11. A calendar calculating device having relatively movable members, theindicia on one member adapted to conjoin with the indicia on a secondmember, the indicia on a second member adapted to conjoin with theindicia on a third member, and the indicia on a third member adapted toconjoin with the indicia on the rst member, the Whole structure beingadapted so that when an indicator on the rst mentioned member is set tocentury figures on the second mentioned member, and an indicator on thesecond mentioned member is set to year figures on the third mentionedmember, the month names on the first mentioned member will conjoin withproper day figures on the third mentioned member, and the Whole calendarof the selected year Will then be shown.

12. A calendar calculating device having a top member with an indicatorwhich selects indicia on a middle member, a middle member having anindicator which selects indicia on a bottom member, and a bottom memberwith indicia which then conjoin with indicia on the top member, theWhole structure being adapted so that when the indicator settings aremade the indicia on the top member and on the bottom member conjoin togive the proper months and days of the selected year.

NEAL F. MEARS.

